Hi Ralph,

As I see, I thought I was forgetting something - makes sense that it was 
Minix that ran on the older CPUs.

Hamish


On 03/10/18 09:16, Ralph Corderoy wrote:
> Hi Terry,
>
> The `monitor' I was thinking of is a
> https://en.wikipedia.org/wiki/Machine_code_monitor and I think your one
> is https://en.wikipedia.org/wiki/Resident_monitor
>
> Hamish, you're right.  The Linux kernel wanted 80386.  The 80286 had
> memory protection, but Linus bought his first PC, an Intel 80386DX,
> 33 MHz, 4 MiB, 40 MB, on 1991-01-05.  Minix ran on the 80286.
>
> https://github.com/jbruchon/elks#readme is a derivative of the Linux
> kernel for 16-bit x86, including the 80286.  http://www.uclinux.org/ is
> another spin off for small processors, typically without an MMU.  Both
> have died away as Linux-capable processors have got cheaper, e.g. ARM.
>
> Sticking with Linux, just, the Linux Foundation is behind the Zephyr
> real-time OS for small devices.  They didn't call it ZINL.
> https://www.zephyrproject.org/
>
> Terry, what was this 12 V v. 3 V thing you were talking about?  Looking
> at the schematic through the laptop's lid, I never understood.  :-)
>
> Cheers, Ralph.
>
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